configs: small fix to ruby portion of fs.py and se.py

In fs.py the io port controller was being attached to the iobus multiple
times.  This should be done only once.  In se.py, the the option use_map
was being set which no longer exists.

configs/example/se.py

@@ -225,7 +225,6 @@ if options.ruby:
         print >> sys.stderr, "Ruby requires TimingSimpleCPU or O3CPU!!"
         sys.exit(1)
 
-    options.use_map = True
     Ruby.create_system(options, False, system)
     assert(options.num_cpus == len(system.ruby._cpu_ports))